JPS59193967A - Vinyl chloride resin dispersion coating material - Google Patents

Abstract

PURPOSE:The titled coating material, containing a granular inorganic filler having a specific particle diameter and hardness in vinyl chloride resin in a specific proportion, and capable of giving surface films having reduced staining properties by exposure and good surface hardness. CONSTITUTION:A coating material containing 100pts.wt. vinyl chloride resin and 10-100pts.wt. granular inorganic material having 3-100mu average particle diameter and 2-14, preferably 6-13 Mohs hardness, preferably gypsum, calcium bicarbonate, glass, quartz, silica sand, alumina or silicon carbide consisting essentially of simple substance or a mixture of CaO, CaCO3, MgO, SiO2, Al2O3 or SiC.

Description

[Detailed Description of the Invention] The present invention relates to a vinyl chloride resin dispersion paint,
More specifically, the present invention relates to a vinyl chloride resin dispersion paint which is made by blending a specific amount of a specific inorganic material into a vinyl chloride resin and which has excellent resistance to exposure and staining and can provide a surface coating film with good surface hardness.

Among synthetic resin-coated steel sheets, vinyl chloride resin-coated steel sheets can withstand bending, punching, deep drawing, etc., and can be coated with a thick film, so they have excellent weather resistance and corrosion resistance, and are expected to be used in a wide range of applications. There is.

However, since it contains a plasticizer, there is a problem with surface hardness.
To improve this, for example, the amount of plasticizer in vinyl chloride resin dispersion paints is often reduced, using solvents, or blending fine resins such as acrylic resins.

However, for exterior applications, a thick coating (100 to 300 μm) is required for the purpose of imparting weather resistance and corrosion resistance. This results in the problem of not being able to obtain a uniform coating film.In addition, coatings made of vinyl chloride resin are susceptible to dirt and dust adhering to them when exposed outdoors, making them susceptible to contamination and deteriorating the aesthetic appearance (R). However, the advantages of vinyl chloride resin dispersion paints can be used as they are for exterior applications, and they have improved painting workability and
If a dispersion-type paint that can improve the surface hardness of a coating film without impairing coating performance and provide a coated surface with excellent resistance to exposure and staining could be produced, it would greatly benefit the industry.

As a result of various studies in view of the above, we have found that the above-mentioned vinyl chloride resin dispersion paint has a particle size of 3 to 100μ and a Mohs hardness of 2 to 14. The present invention was completed after finding out that a vinyl chloride resin dispersion paint characterized by containing 10 to less than 100 parts (by weight) of vinyl chloride resins satisfies the purpose of the invention very well.

The dispersion paint of the present invention is usually applied to pre-coated steel sheets and has excellent weather resistance, corrosion resistance, workability, chemical resistance, moisture resistance, etc., has high surface hardness and is hard to scratch, and has excellent resistance to exposure and contamination. Can provide a coating film.

The vinyl chloride resin dispersion paint used as a base in the present invention may be either a normal plastisol in which vinyl chloride resin powder is dispersed in a plasticizer, or an organosol in which it is partially dispersed in a solvent or mixed with various resins. do not have.

However, preferably, for example, 100 parts of vinyl chloride paste resin, 30 to 70 parts of plasticizer, 3 to 6 parts of stabilizer,
Color pigment 5-30 parts, additive 0.5-1 part (each part by weight)
It is a common plastisol consisting of. In addition, due to the addition of granular inorganic materials and the storage stability of the formulation, the paint viscosity is B type precision type, V30 = 1000 to 8000 c.
ps is desirable.

The inorganic material used in the present invention has a Mohs hardness of 2 to
No. 14 is a granular inorganic filler having an average particle size of 3 to 100 μm. Examples of such inorganic materials having a Mohs hardness of 2 to 14 include Cab, CaCO3, h'Qo, and SiO2°A.
Examples include various materials whose main components are single substances such as Ca0.t203, SIC, and Ca5Oa, as well as mixtures thereof. Cac'03
, MgO, SiO2, .DELTA.1203.degree. SiC, singly or in a mixture, as main components, stone wax, car chassis, glass, quartz, silica sand, alumina, silicon carbide, etc. are particularly preferably used.

The particle size of the granular inorganic material also depends on the film thickness of the coating film, but when considering the normal coating film thickness (100 to 300μ), in the present invention, the average particle size is required to be 3 to 100μ. be. This is because if the particle size is too small, the object of the invention will not be achieved, and if the particle size is too large, exceeding 100 microns, a uniform coating will not be obtained.

The amount of this substance mixed into the base paint is 10 to 300.
Less than PHR, (number of parts based on 100 parts of vinyl chloride resin)
can be selected. In order to increase the surface hardness, it is possible to increase the amount of filler (it is desirable to increase the amount, but if too much is added, it will not be possible to achieve a uniform coating in continuous coating work, and it will also affect the exterior appearance in terms of coating film performance. It is inappropriate to use it repeatedly. Therefore, the upper limit is limited to about 100 PHR.

On the other hand, if the suspension of the filler is less than 10 PHR, it is not desirable because the reinforcing effect of the filler cannot be obtained.

The inorganic filler and the paint can be mixed using a conventional high speed stirrer and stored as a mixture, or the inorganic filler can be mixed into the paint before application. If the vinyl chloride resin dispersion paint is sufficiently mixed, it will not settle in a short period of time because it has viscosity. (When storing, it is particularly preferable to use a base sol paint with a high viscosity relative to sedimentation properties and a filler with a specific gravity of 3.0 or less.) The baked coating film of the paint of the present invention is When compared to a sol coating film, the gloss tends to decrease when the amount of particulate inorganic material is large, but the coating film has a marketable feel and does not pose any problem. In addition, the coating film has better moisture permeability than ordinary sol coatings without impairing processability.

The present invention will be explained below with reference to Examples.

Examples 1 to 16 To Vinisol 10000 A PVC sol paint containing granular airless material was obtained.

Galvanized steel sheet (thickness 0
．． 27 m/m ), apply an undercoat paint for PVC sol (epoxy-modified acrylic resin) to a dry film thickness of 3 to 5 μm.
Painted with Ralcoater, the maximum temperature reached by the material is 200℃
Bake for 60 seconds until it looks like this. Next, use a reverse coater to apply the above granular inorganic particles-containing tile bisol paint to a dry film thickness of 200.
The material was coated so as to have a thickness of μ and baked so that the maximum temperature reached by the material was 200°C to obtain a vinyl chloride resin coated steel sheet containing granular inorganic material.

The coating film performance of the obtained coated steel sheet is shown in Table 2.

(Leaving space below) Table ■ * Parts by weight for 100 parts of vinyl chloride paste resin ■ C) Degree test method and criteria Note 1) Paintability: Evaluate paintability with reverse roll caulk ○: A good, uniform coating film Obtained ×: A uniform coating film cannot be obtained due to streaks, bumps, etc. Note 2) Surface scratch resistance: Scratch the coating surface with a fingernail to determine whether any marks remain ◎: No abnormality at all ○: There are some marks Δ : Leaves marks Note 3) Exposure contamination After carrying out outdoor wing dew for one year in Neyagawa City, Osaka Prefecture, the degree of contamination of the paint film was determined.

O: Low degree of contamination △: Contamination ×: Significant contamination Note 4) Processability Bend the painted plate 180° and determine if there is any cracking at the bent part.

◎: No abnormalities 2b) 'a i9i degree JIS Z 0208t Koyoru cup method test (unit (1/m" 24 hr) Procedural amendment August 25, 1980 Director of the Patent Office Case 1 Showa 1958 Patent Application No. o6762zso2 Name of Invention Vinyl Chloride Resin Dispersion Paint 3 Relationship with the Person Who Amended Case Patent Applicant Address 2-1-2 Oyodokita, Oyodo-ku, Osaka-shi, Osaka Name Representative of Nippon Paint Co., Ltd. Masao Suzuki 4 Agent address 6th floor, Building River Center, 3-57 Kyobashi, Higashi-ku, Osaka, Osaka 540 Name Patent attorney (6871) Takeo Ito Date of amendment order 5 - Contents of amendment 8 As per attached sheet 1, Specification On page 5, line 5, the statement r~300PHRJ is corrected to read r~100PHRI.

that's all

Claims (1)

[Claims] Average particle size 3 to 1 per 100 parts of vinyl chloride resin
A vinyl chloride resin dispersion paint comprising 10 to less than 100 parts by weight of a granular inorganic material having a Mohs hardness of 0.00 μm and a Mohs hardness of 2 to 14.